EXS 24 Logic Sampler Users Group

I'm a newbie I'm afraid. The EXS24 is the first sampler of any kind I've
owned. Would it be best for me to try to restrict my sample library
purchases to EX24 format CD Roms?... Or would that just be
ultra-restrictive? Is it worth buying Akai libraries?(I'm on a Mac with
LA4.7), or are the conversion issues too serious- does it handle S3000
at all? As a technoklutz I would be grateful for some guidance.  mike pg